I'm teaching myself some small electronics projects and looking for a network in the UK that will allow me to top up by e.g. £5 and leave it for as long as possible - likely 6 months, before having to top it up again to keep it active.

It will be monitoring and sending data back in tiny packets every month a few things.

I can remember Vodafone used to do it, but not sure if they do anymore.

Also, I might need a couple of them in different locations, so if any networks provide a SIM for free, or as close to (e.g. £1) that will stay active.

Are there any? EE don't. I don't think. They deactivated my SIM before I even got to top it up.. 😁

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[–] 5 points 1 week ago* (last edited 1 week ago) (1 child)

Try checking RWG Mobile , ScanCom or Mozillion

I bought a SIM card from RWG a while back that was a 1 time payment for 2 years contract for 1GB data per month. It was so cheap I never actually got round to using it.

I believe the other 2 do similar plans.

EDIT -

If you have no luck try searching IOT SIM / Internet Of Things SIM / Prepaid Sim

I can see some offers for 500mb valid for 5 years for £5

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